Siemens SIMODRIVE 611 universal Function Manual page 349

01.99 02.02
The torque/power can be reduced continuously by reducing the cur-
rently effective torque limit using "MomRed" control word (refer to
Chapter 5.6.6). The result of the conversion is a percentage factor k
which is applied to P1230 (torque limit) and P1235 (power limit). For
the specified k factor, P1230 is replaced by k*P1230 and P1235, by
k*P1235 in Fig. 6-7.
Table 6-8 Parameters for limits
No. Description
1145 Stall torque reduction factor
... the start of stall torque limiting can be changed (refer to Fig. 6-7).
For a setting greater than 100%, the intervention point is increased.
For a setting of less than 100%, the intervention point is decreased.
1230:8 1st torque limit value (SRM, ARM)
1st force limit value (SLM)
... specifies the maximum torque referred to the pull–out torque (SRM), rated motor torque
(ARM) or stall force (SLM) of the motor.
SRM/SLM:
Stall torque/stall force = P1118 S P1113
P1118: Motor standstill (stall) current
P1113: Torque constant
ARM:
Rated motor torque
P1130: Rated motor power
P1400: Rated motor speed
The minimum of the torque, power and stall torque limits are always effective as limit (refer to
Fig.6-7). The standard pre–assignment for ARM is 100%.
For SRM/SLM, this is realized with the following operator action Calculate controller data,
whereby the value is obtained from the following formula:
P1230 = (P1104/P1118) S 100 %
SRM/SLM:
The following is especially true for ARM:
In order to achieve significantly shorter accelerating times up to the maximum speed, the power
and current limits must also be increased.
Important:
If the motor is overloaded for a longer period of time, this can result in an impermissible temper-
ature rise (the drive is shutdown as a result of a motor overtemperature condition); the motor
can also be destroyed.
E Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
6.1 Operating mode, speed/torque setpoint (P0700 = 1)
Parameters
Min.
5.0 100.0
5.0 100.0
= ((P1130 S 1000)/(2π S P1400/60))
= 9549.3
6 Description of the Functions
Standard Max. Units
1 000.0 %
900.0 %
S (P1130/P1400)
Effec-
tive
Imme-
diately
Imme-
diately
6
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